Current transformer

Abstract

The utility model relates to a current transformer. The current transformer comprises a shell, a first winding, a second winding and a wire, the shell comprises a first shell, the first shell comprises a first hinged end and a first clamping end, and a first cable groove is formed in the side wall of the first shell; the second shell comprises a second hinge end and a second clamping end, the second hinge end is hinged to the first hinge end of the first shell, and a second cable groove is formed in the side wall of the second shell; the first clamping structure is arranged at the first clamping end of the first shell; and the second clamping structure is arranged at the second clamping end of the second shell, the second clamping structure is matched with the first clamping structure, and when the second clamping structure is clamped with the first clamping structure, the first cable groove and the second cable groove form a through hole capable of accommodating a tested cable. The first shell and the second shell are clamped through the first clamping structure and the second clamping structure, looseness during connection of the first shell and the second shell is avoided, and the detection safety is improved.

Description

Technical Field

[0001] The present application relates to the field of current detection equipment, and in particular to a current transformer. Background Art

[0002] In power systems, current transformers are widely used for current measurement and monitoring in distribution systems. Existing open-type current transformers, due to their ability to operate without power outages, have gradually become important detection equipment in power systems. However, the locking mechanism of open-type current transformers typically uses screws, making installation cumbersome. Furthermore, the windings in current transformers typically have an insulating layer on the iron core. Traditionally, this thick insulation layer occupies additional space, increases the total length of the coil, and increases the size of the entire current transformer. This, in turn, limits its deployment and application in compact or confined spaces. Utility Model Content

[0003] In order to at least partially solve the above problems, the present application provides a current transformer, in which the connection of the housing is achieved through a snap-fit ​​structure.

[0004] An embodiment of the present application provides a current transformer, including a housing, wherein the housing includes:

[0005] A first housing, comprising a first hinged end and a first clamping end, the first housing having a first accommodating cavity, a side wall of the first housing being provided with a first cable groove, and the first winding being provided in the first accommodating cavity;

[0006] a second housing, comprising a second hinged end and a second clamping end, the second hinged end being hingedly connected to the first hinged end of the first housing, the second housing having a second accommodating cavity, a side wall of the second housing being provided with a second cable groove, and the second winding being provided in the second accommodating cavity;

[0007] a first engaging structure, disposed at the first engaging end of the first housing;

[0008] a second engaging structure provided at the second engaging end of the second housing, the second engaging structure being adapted to the first engaging structure, and when the second engaging structure is engaged with the first engaging structure, the first cable trough and the second cable trough form a through hole capable of accommodating a cable under test;

[0009] The current transformer also includes:

[0010] A first winding is arranged in the first accommodating cavity;

[0011] A second winding is disposed in the second accommodating cavity; and

[0012] The wires are arranged in the housing, and the wires include a first wire and a second wire. The first wire is electrically connected to the first winding, and the second wire is electrically connected to the second winding.

[0013] According to some embodiments of the present application, the first hinged end of the first shell is provided with a first protrusion, and the first protrusion can abut against the second shell to limit the first clamping end of the first shell from rotating in a direction away from the second shell.

[0014] According to some embodiments of the present application, the first engaging structure includes a card slot, and the card slot is provided at the first card end;

[0015] The second clamping end is provided with a sliding hole, and the second clamping structure includes:

[0016] A sliding post is slidably disposed in the sliding hole, and the bottom end of the sliding post can slide into the slot;

[0017] an elastic member disposed in the second housing, capable of pushing the sliding post to move toward the slot;

[0018] The upper cover is arranged on the top end of the sliding column.

[0019] According to some embodiments of the present application, the current transformer further includes a compression structure, and the compression structure is used to compress the cable under test.

[0020] According to some embodiments of the present application, the compression structure includes:

[0021] a first pressing block, disposed in the first cable slot;

[0022] The second pressing block is arranged in the second cable groove, and the first pressing block and the second pressing block can respectively abut against the tested cable.

[0023] According to some embodiments of the present application, the compression structure includes:

[0024] a first boss, disposed on a side wall of the first shell;

[0025] a second boss, disposed on a side wall of the second shell;

[0026] a third pressing block, slidably disposed on the second boss;

[0027] The locking structure is provided on the second boss and can push the third pressing block to slide, so that the third pressing block and the first boss press the cable under test.

[0028] According to some embodiments of the present application, both the first winding and the second winding include:

[0029] Iron core;

[0030] Sheath, including:

[0031] The first end plate is provided with a first through hole;

[0032] A second end plate is provided with a second through hole, and the iron core passes through the first through hole and the second through hole respectively;

[0033] a top plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate;

[0034] a bottom plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate;

[0035] a first insulating layer, disposed on one side of the iron core, the first insulating layer respectively connecting the first end plate, the second end plate, the top plate, and the bottom plate, and a thickness of the first insulating layer being less than a thickness of the top plate;

[0036] a second insulating layer, disposed on the other side of the iron core, the second insulating layer respectively connecting the first end plate, the second end plate, the top plate, and the bottom plate, and a thickness of the second insulating layer being less than a thickness of the top plate;

[0037] The coil is arranged on the sheath.

[0038] According to some embodiments of the present application, the first insulating layer and the second insulating layer both include an insulating film, the insulating film is connected to the sheath, and the thickness of the insulating film is 0.05-0.2 mm.

[0039] According to some embodiments of the present application, the first end plate includes:

[0040] A first sub-plate is provided with a first groove;

[0041] A second sub-plate is provided with a second groove, the first sub-plate abuts against the second sub-plate, and the first groove and the second groove form the first through hole;

[0042] The second end plate comprises:

[0043] A third sub-board is provided with a third groove, and the top board is connected to the first sub-board and the third sub-board respectively;

[0044] The fourth sub-board is provided with a fourth groove. The bottom plate is respectively connected to the second sub-board and the fourth sub-board. The third sub-board abuts against the fourth sub-board. The third groove and the fourth groove form the second through hole.

[0045] According to some embodiments of the present application, a side wall of the second end plate is provided with a wire clamping slot, and the wire clamping slot is used to clamp the wire.

[0046] The present application realizes the clamping connection between the first shell and the second shell through the first clamping structure and the second clamping structure, which makes it easy to put the current transformer on the cable under test and prevents the first shell and the second shell from loosening when connected, thereby improving the safety of the detection. The winding of the present application is provided with a sheath, a first insulating layer and a second insulating layer on the iron core. The thickness of the first insulating layer and the second insulating layer are both less than the thickness of the sheath top plate, so that the coil can be more compact when winding, and the total length of the coil is reduced, thereby reducing the overall volume and weight of the current transformer. In addition, the miniaturized current transformer has greater flexibility in installation and deployment, and is suitable for various compact installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by this application.

[0048] Figure 1 is a schematic diagram of a current transformer according to an embodiment of the present application;

[0049] Figure 2 Schematic diagram of the internal structure of the current transformer according to the embodiment of the present application;

[0050] Figure 3 is a schematic diagram of a first shell and a second shell according to an embodiment of the present application;

[0051] Figure 4 is a schematic diagram of the first protrusion and the second protrusion of an embodiment of the present application;

[0052] Figure 5 This is a schematic diagram of a snap-fit ​​structure according to an embodiment of the present application;

[0053] Figure 6 is a schematic diagram of another engaging structure according to an embodiment of the present application;

[0054] Figure 7 This is a schematic diagram of a compression structure according to an embodiment of the present application;

[0055] Figure 8 is a schematic diagram of another compression structure according to an embodiment of the present application;

[0056] Figure 9 This is a schematic diagram of the locking structure of an embodiment of the present application;

[0057] Figure 10 is a schematic diagram of the third pressing block in the embodiment of the present application;

[0058] Figure 11 is a schematic diagram of a winding according to an embodiment of the present application;

[0059] Figure 12 is a schematic diagram of an embodiment of the present application in which the winding of the coil is removed;

[0060] Figure 13 is a schematic diagram of a sheath according to an embodiment of the present application;

[0061] Figure 14 It is an exploded view of the sheath of an embodiment of the present application;

[0062] Figure 15 is a schematic diagram of the positioning structure of an embodiment of the present application;

[0063] Figure 16 It is a schematic diagram of the iron core of an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following is a clear and complete description of the technical solution of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of this application.

[0065] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a current transformer 100, which includes a housing 10, a first winding 20, a second winding 30, and a conductor 40. The housing 10 includes a first shell 1, a second shell 2, a first engaging structure 3, and a second engaging structure 4.

[0066] like Figure 3 As shown, the first housing 1 includes a first hinged end 1a and a first clamping end 1b. The first housing 1 has a first accommodating cavity 11, in which the first winding 20 is disposed. The shape of the first accommodating cavity 11 is adapted to the first winding 20. A first cable groove 12 is provided on the side wall of the first housing 1 near the second housing 2. The first cable groove 12 is generally semicircular.

[0067] The second housing 2 includes a second hinged end 2a and a second clamping end 2b. The second housing 2 has a second accommodating cavity 21, the shape of which is adapted to accommodate the second winding 30. The second winding 30 is disposed within the second accommodating cavity 21. A second cable trough 22 is provided on the side wall of the second housing 2 adjacent to the first housing 1. The second cable trough 22 is generally semicircular.

[0068] The second hinged end 2a of the second housing 2 is hingedly connected to the first hinged end 1a of the first housing 1. For example, an axis hole 13 is provided on the side wall of the first hinged end 1a, and a rotating shaft 23 is provided at the second hinged end 2a. The rotating shaft 23 is inserted into the axis hole 13 to realize the hinged connection between the second hinged end 2a and the first hinged end 1a.

[0069] A first engaging structure 3 is provided at the first engaging end 1b of the first housing 1. A second engaging structure 4 is provided at the second engaging end 2b of the second housing 2, and the second engaging structure 4 is adapted to the first engaging structure 3. When the second engaging structure 4 is engaged with the first engaging structure 3, the first housing 1 and the second housing 2 cannot move relative to each other. The bottom end of the first winding 20 abuts the bottom end of the second winding 30, and the top end of the first winding 20 abuts the top end of the second winding 30. The first cable groove 12 and the second cable groove 22 form a through hole capable of accommodating the cable 200 under test.

[0070] The wire 40 is provided on the housing 10 , for example, on the second hinge end 2 a of the second housing 2 . The wire 40 includes a first wire 410 and a second wire 420 . The first wire 410 is electrically connected to the first winding 20 , and the second wire 420 is electrically connected to the second winding 30 .

[0071] When using the current transformer 100, the first clamping end 1b of the first shell 1 is separated from the second clamping end 2b of the second shell 2, and the current transformer 100 is put on the cable under test 200 so that the cable under test 200 is located in the through hole formed by the first cable groove 12 and the second cable groove 22. The first shell 1 or the second shell 2 is rotated so that the second clamping structure 4 is clamped with the first clamping structure 3, the bottom end of the first winding 20 is abutted with the bottom end of the second winding 30, and the top end of the first winding 20 is abutted with the top end of the second winding 30, so as to detect the cable under test 200.

[0072] In this embodiment, the first housing 1 and the second housing 2 are connected by the first locking structure 3 and the second locking structure 4, which facilitates the installation of the current transformer 100 on the cable 200 under test and prevents the first housing 1 and the second housing 2 from loosening during connection, thereby improving the safety of detection.

[0073] like Figure 4 As shown, in some embodiments, a first protrusion 14 is provided on the end surface of the first hinged end 1a of the first housing 1. When the first clamping end 1b of the first housing 1 is rotated away from the second housing 2, the first protrusion 14 can abut the side wall of the second housing 2 to limit the first clamping end 1b of the first housing 1 from further rotation away from the second housing 2, thereby preventing the current transformer from being excessively opened.

[0074] In some embodiments, a second protrusion 15 is provided on the sidewall of the first hinged end 1a of the first housing 1. Optionally, the second protrusion 15 is substantially rectangular. A first wire hole 16 is provided on the second protrusion 15. The first wire hole 16 communicates with the first accommodating cavity 11. The first wire 410 passes through the first wire hole 16 and enters the first accommodating cavity 11.

[0075] The second housing 2 is provided with a receiving hole 24 adapted to fit the second protrusion 15. Optionally, the receiving hole 24 is communicated with the second receiving cavity 21. The first wire 410 passes through the receiving hole 24 and the first wire hole 16 and enters the first receiving cavity 11.

[0076] Glue is filled between the hole wall of the first wire hole 16 and the first wire 410 to fix the first wire 410 and prevent the rotation of the first housing 1 from affecting the connection between the first wire 410 and the first winding 20 .

[0077] like Figure 5 As shown, in some embodiments, the first engaging structure 3 includes a clamping plate 31. The clamping plate 31 is located above the first engaging end 1b, with one end of the clamping plate 31 connected to the first engaging end 1b. The other end of the clamping plate 31 is provided with a clamping hole 32. The second engaging structure 4 includes a first clamping hook 41, which is provided at the second engaging end 2b. The first clamping hook 41 can be clamped into the clamping hole 32.

[0078] Optionally, the end surface of the first hook 41 proximal to the first housing 1 is an inclined surface. When the first housing 1 approaches the second housing 2, the first hook 41 abuts against the retaining plate 31, slightly lifting the retaining plate 31 and causing elastic deformation of the retaining plate 31. After the first hook 41 moves into the retaining hole 32, the retaining plate 31 returns to its original position, completing the engagement between the first hook 41 and the retaining plate 31.

[0079] like Figure 6 As shown, in some embodiments, the first engaging structure 3 includes a slot 33, which is provided at the top of the first engaging end 1a. The second engaging end 2b is provided with a sliding hole 25. The second engaging structure 4 includes: a slide post 42, an elastic member 43 and an upper cover 44. The slide post 42 is slidably provided in the sliding hole 25, the top end of the slide post 42 is located outside the sliding hole 25, and the bottom end of the slide post 42 can slide into the slot 33. The elastic member 43 is provided in the second shell 2, and the elastic member 43 can push the slide post 42 to move in a direction close to the slot 33 so that the slide post 42 remains in the slot 33. Optionally, the elastic member 43 is a spring, one end of the elastic member 43 is connected to the slide post 42, and the other end of the elastic member 43 abuts against the inner wall of the second shell 2.

[0080] To connect the first and second housings 1 and 2, the first housing 1 is rotated toward the second housing 2. The first housing 1 contacts and lifts the slide post 42, causing the elastic member 43 to elastically deform. The first housing 1 continues to rotate, causing the slide post 42 to slide into the slot 33, and the elastic member 43 to return to its original position, completing the connection between the first and second housings 1 and 2.

[0081] When the first shell 1 and the second shell 2 need to be separated, the slide post 42 is appropriately lifted, the bottom end of the slide post 42 is disengaged from the slot 33, and the first shell 1 is rotated away from the second shell 2 to separate the first shell 1 and the second shell 2.

[0082] The upper cover 44 is provided at the top of the slide post 42. The length of the upper cover 44 is greater than the aperture of the slide hole 25. The upper cover 44 is provided to facilitate lifting the slide post 42, and the upper cover 44 can also limit the slide post 42 from sliding downward excessively.

[0083] like Figure 7 As shown, in some embodiments, the housing 100 further includes a clamping structure 5. When the first shell 1 and the second shell 2 are clamped, the clamping structure 5 is used to clamp the cable under test 200 to prevent relative movement between the current transformer and the cable under test 200 during the detection process.

[0084] In some embodiments, the compression structure 5 includes a first compression block 51 and a second compression block 52. The first compression block 51 and the second compression block 52 are both roughly semicircular in shape. The first compression block 51 is disposed in the first cable trough 12, and the second compression block 52 is disposed in the second cable trough 22. When the first housing 1 and the second housing 2 are engaged, the first compression block 51 and the second compression block 52 can respectively abut against the cable under test 200 to compress the cable under test 200. Optionally, the first compression block 51 and the second compression block 52 are both rubber and can elastically deform when abutting against the cable under test 200.

[0085] like Figure 8 and Figure 9 As shown, in some embodiments, the pressing structure 5 includes: a first boss 53 , a second boss 54 , a third pressing block 55 and a locking structure 56 .

[0086] A first boss 53 is provided on a side wall of the first housing 1, and a second boss 54 is provided on a side wall of the second housing 2. The cable under test 200 is located between the first boss 53 and the second boss 54, and the first boss 53 can abut the cable under test 200. A third pressure block 55 is slidably provided on the second boss 54, and the third pressure block 55 can abut the cable under test 200.

[0087] The locking structure 56 is provided on the second boss 54. The locking structure 56 can push the third pressing block 55 to slide toward the first boss 53, so that the third pressing block 55 and the first boss 53 press the tested cable 200. Optionally, both the first boss 53 and the third pressing block 55 are provided with grooves adapted to the tested cable 200.

[0088] like Figure 9 and Figure 10 As shown, in some embodiments, the second boss 54 is provided with a pressing block cavity 541 adapted to accommodate the third pressing block 55. A guide block 551 is provided on the side wall of the third pressing block 55, and a guide groove adapted to accommodate the guide block 551 is provided on the inner wall of the pressing block cavity 541, so that the third pressing block 55 can slide in the pressing block cavity 541 without completely sliding out of the pressing block cavity 541.

[0089] The locking structure 56 includes a nut 561 and a screw 562. A nut hole 542 is provided on the second boss 54, communicating with the pressure block cavity 541. The nut 561 is inserted into the nut hole 542. The screw 562 mates with the nut 561 and abuts against the third pressure block 55, pushing it to compress the cable under test 200. Loosening the screw 562 releases the third pressure block 55 from compressing the cable under test 200.

[0090] like Figure 11 and Figure 12 As shown, the first winding 20 and the second winding 30 both include: an iron core 6 , a sheath 7 , a first insulating layer 81 , a second insulating layer 82 and a coil 9 .

[0091] like Figure 13 As shown, the sheath 7 includes: a first end plate 71, a second end plate 72, a top plate 73 and a bottom plate 74. The first end plate 71 is provided with a first through hole 711, and the second end plate 72 is provided with a second through hole 721. One end of the top plate 73 is connected to the side wall of the first end plate 71, and the other end of the top plate 73 is connected to the side wall of the second end plate 72. The bottom surface of the top plate 73 is flush with the top hole wall of the first through hole 711 and the top hole wall of the second through hole 721. One end of the bottom plate 74 is connected to the side wall of the first end plate 71, and the other end of the bottom plate 74 is connected to the side wall of the second end plate 72, and the top surface of the bottom plate 74 is flush with the bottom hole wall of the first through hole 711 and the bottom hole wall of the second through hole 721.

[0092] The first through hole 711 and the second through hole 721 are both adapted to the iron core 6, and the iron core 6 passes through the first through hole 711 and the second through hole 771, respectively. The shapes of the top plate 73 and the bottom plate 74 are adapted to the shape of the iron core 6. For example, if the iron core 6 is roughly semicircular, the top plate 73 and the bottom plate 74 are both in the shape of a minor arc ring. The top plate 73 covers a portion of the top surface of the iron core 6, and the bottom plate 74 covers a portion of the bottom surface of the iron core 6. Openings are formed on both the inner and outer sides of the sheath 7. Optionally, the thickness of the top plate 73 and the thickness of the bottom plate 74 are the same.

[0093] The first insulating layer 81 is provided on the inner side of the iron core 6. The first insulating layer 81 is connected to the first end plate 71, the second end plate 72, the top plate 73 and the bottom plate 74 respectively. The first insulating layer 81 closes the inner opening of the sheath 7. The thickness of the first insulating layer 81 is less than that of the top plate 73. Figure 12 As shown, the thickness of the top plate 73 is the Z-direction dimension of the top plate 73 , and the thickness of the first insulating layer 81 is the X-direction dimension of the first insulating layer 81 . Figure 12 The X direction, Y direction and Z direction are perpendicular to each other.

[0094] A second insulating layer 82 is disposed outside the core 6 and connects the first end plate 71, the second end plate 72, the top plate 73, and the bottom plate 74. The second insulating layer 82 seals the outer opening of the sheath 7. The thickness of the second insulating layer 82 is less than that of the top plate 73 and is equal to the X-direction dimension of the second insulating layer 82.

[0095] The sheath 7, first insulating layer 81, and second insulating layer 82 are all made of insulating materials. The coil 9 is formed by winding enameled wire around the sheath 7. The first insulating layer 81 insulates the inner wall of the core 6 from the coil 9, while the second insulating layer 82 insulates the outer wall of the core 6 from the coil 9.

[0096] In this embodiment, the iron core 6 and the coil 9 are insulated by the sheath 7, the first insulating layer 81, and the second insulating layer 82. The thickness of the first insulating layer 81 and the second insulating layer 82 are both less than the thickness of the top plate 73, making the coil 9 more compact during winding. At the same time, the total length of the coil 9 is reduced, thereby reducing the overall volume and weight of the current transformer 100. In addition, the miniaturized current transformer has greater flexibility during installation and deployment and is suitable for various compact installation environments.

[0097] In some embodiments, the first insulating layer 81 and the second insulating layer 82 are respectively bonded to the iron core 6 to more firmly fix the first insulating layer 81 and the second insulating layer 82.

[0098] In some embodiments, both the first insulating layer 81 and the second insulating layer 82 are insulating films, for example, made of polyimide (PI). The insulating film of the first insulating layer 81 is disposed on the inner side of the sheath 7 and is connected to the first end plate 71, the second end plate 72, the top plate 73, and the bottom plate 74. The thin film of the second insulating layer 82 is disposed on the outer side of the sheath 7 and is connected to the first end plate 71, the second end plate 72, the top plate 73, and the bottom plate 74.

[0099] In some embodiments, the thickness of the insulating film is 0.05-0.2 mm, and the thickness of the top plate 73 and the thickness of the bottom plate 74 are both 0.6-0.8 mm.

[0100] like Figure 14 As shown, the first end plate 71 includes a first sub-plate 712 and a second sub-plate 713. One end of the top plate 73 is connected to the first sub-plate 712, and one end of the bottom plate 74 is connected to the second sub-plate 713. A first groove 714 is provided on the bottom surface of the first sub-plate 712, and a second groove 715 is provided on the top surface of the second sub-plate 713. The first sub-plate 712 abuts the second sub-plate 713, and the first groove 714 and the second groove 715 form a first through-hole 711.

[0101] The second end plate 72 includes a third sub-plate 722 and a fourth sub-plate 723. The other end of the top plate 73 is connected to the third sub-plate 722, and the other end of the bottom plate 74 is connected to the fourth sub-plate 723. A third groove 724 is provided on the bottom surface of the third sub-plate 722, and a fourth groove 725 is provided on the top surface of the fourth sub-plate 723. The third sub-plate 722 and the fourth sub-plate 723 abut against each other, and the third groove 724 and the fourth groove 725 form a second through hole 721.

[0102] The first end plate 71 and the second end plate 72 are configured as separate parts to facilitate the connection between the sheath 7 and the iron core 6 .

[0103] like Figure 2 and Figure 4 As shown, the edge of the first end plate 71 is located outside the top plate 73 and the bottom plate 74, and the edge of the second end plate 72 is also located outside the top plate 73 and the bottom plate 74. When the coil 9 is wound on the sheath 7, one end of the coil 9 abuts the first end plate 71, and the other end of the coil 9 abuts the second end plate 72. The first end plate 71 and the second end plate 72 serve to limit the coil 9.

[0104] Optionally, the first end plate 21 and the second end plate 72 are adapted to the inner wall of the housing 10 to fix the winding.

[0105] like Figure 15As shown, in some embodiments, the sheath 7 further includes a first positioning structure 75, which is disposed on the top plate 73 and / or the bottom plate 74. For example, the first positioning structure 75 includes a first positioning post 751 and a second positioning post 752, wherein the first positioning post 751 is disposed on the top plate 73 and the second positioning post 752 is disposed on the bottom plate 74.

[0106] The core 6 includes a second positioning structure 61 that matches the first positioning structure 75. For example, the second positioning structure 61 includes a positioning hole that is a through hole. The first positioning post 751 is inserted into the positioning hole from above, and the second positioning post 752 is inserted into the positioning hole from below.

[0107] In some embodiments, the sidewall of the second end plate 72 is provided with a wire retaining slot 76. The wire connecting the coil 9 passes through the wire retaining slot 76. The wire retaining slot 76 engages with the wire to prevent loosening of the connection between the wire and the coil 9. Optionally, a wire retaining slot 76 is also provided on the first end plate 71. For example, the wire retaining slot 76 of the first winding 20 engages with the first wire 410, and the wire retaining slot 76 of the second winding 30 engages with the second wire 410.

[0108] like Figure 16 As shown, in some embodiments, the core 6 includes: a plurality of first chips 62 and a plurality of second chips 63. The second chips 63 are stacked alternately with the first chips 62, and adjacent first chips 62 and second chips 63 are staggered along the circumference of the core 6.

[0109] Optionally, the first chip 62 and the second chip 63 are both substantially semicircular. Two adjacent first chips 62 form a first slot 64 at one end of the core 6, and two adjacent second chips 63 form a second slot 65 at the other end of the core 6. The bottom end of the core of the first winding 20 can be plugged into the bottom end of the core of the second winding 30, and the top end of the core of the first winding 20 can be plugged into the top end of the core of the second winding 30.

[0110] Optionally, after the housing 10 is fully opened, the bottom end of the iron core of the first winding 20 and the bottom end of the iron core of the second winding 30 remain plugged in, and the top end of the iron core of the first winding 20 and the top end of the iron core of the second winding 30 are separated.

[0111] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the technical solutions and core concepts of the present application. Therefore, changes or modifications made by those skilled in the art based on the concepts of the present application, the specific implementation methods, and the scope of application of the present application, all fall within the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A current transformer, characterized in that: comprising a housing, the housing comprising: A first housing, comprising a first hinged end and a first clamping end, the first housing having a first accommodating cavity, and a side wall of the first housing being provided with a first cable groove; a second housing, comprising a second hinged end and a second clamping end, the second hinged end being hingedly connected to the first hinged end of the first housing, the second housing having a second accommodating cavity, and a side wall of the second housing being provided with a second cable groove; a first engaging structure, disposed at the first engaging end of the first housing; a second engaging structure provided at the second engaging end of the second housing, the second engaging structure being adapted to the first engaging structure, and when the second engaging structure is engaged with the first engaging structure, the first cable trough and the second cable trough form a through hole capable of accommodating a cable under test; The current transformer also includes: A first winding is arranged in the first accommodating cavity; A second winding is disposed in the second accommodating cavity; and The wires are arranged in the housing, and the wires include a first wire and a second wire. The first wire is electrically connected to the first winding, and the second wire is electrically connected to the second winding.

2. The current transformer according to claim 1, characterized in that: The first hinged end of the first shell is provided with a first protrusion, and the first protrusion can abut against the second shell to limit the first clamping end of the first shell from rotating in a direction away from the second shell.

3. The current transformer according to claim 1, characterized in that: The first engaging structure includes a card slot, and the card slot is provided at the first card end; The second clamping end is provided with a sliding hole, and the second clamping structure includes: A sliding post is slidably disposed in the sliding hole, and the bottom end of the sliding post can slide into the slot; an elastic member disposed in the second housing, capable of pushing the sliding post to move toward the slot; The upper cover is arranged on the top end of the sliding column.

4. The current transformer according to claim 1, characterized in that: It also includes a compression structure, which is used to compress the cable under test.

5. The current transformer according to claim 4, characterized in that: The compression structure comprises: a first pressing block, disposed in the first cable slot; The second pressing block is arranged in the second cable groove, and the first pressing block and the second pressing block can respectively abut against the tested cable.

6. The current transformer according to claim 4, characterized in that: The compression structure comprises: a first boss, disposed on a side wall of the first shell; a second boss, disposed on a side wall of the second shell; a third pressing block, slidably disposed on the second boss; The locking structure is provided on the second boss and can push the third pressing block to slide, so that the third pressing block and the first boss press the cable under test.

7. The current transformer according to claim 1, characterized in that: The first winding and the second winding each include: Iron core; Sheath, including: The first end plate is provided with a first through hole; A second end plate is provided with a second through hole, and the iron core passes through the first through hole and the second through hole respectively; a top plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate; a bottom plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate; a first insulating layer, disposed on one side of the iron core, the first insulating layer respectively connecting the first end plate, the second end plate, the top plate, and the bottom plate, and a thickness of the first insulating layer being less than a thickness of the top plate; a second insulating layer, disposed on the other side of the iron core, the second insulating layer respectively connecting the first end plate, the second end plate, the top plate, and the bottom plate, and a thickness of the second insulating layer being less than a thickness of the top plate; The coil is arranged on the sheath.

8. The current transformer according to claim 7, characterized in that: The first insulating layer and the second insulating layer both include insulating films, the insulating films are connected to the sheath, and the thickness of the insulating films is 0.05-0.2 mm.

9. The current transformer according to claim 7, characterized in that: The first end plate comprises: A first sub-plate is provided with a first groove; A second sub-plate is provided with a second groove, the first sub-plate abuts against the second sub-plate, and the first groove and the second groove form the first through hole; The second end plate comprises: A third sub-board is provided with a third groove, and the top board is connected to the first sub-board and the third sub-board respectively; The fourth sub-board is provided with a fourth groove. The bottom plate is respectively connected to the second sub-board and the fourth sub-board. The third sub-board abuts against the fourth sub-board. The third groove and the fourth groove form the second through hole.

10. The current transformer according to claim 7, characterized in that: The side wall of the second end plate is provided with a wire clamping slot, and the wire clamping slot is used for clamping the wire.

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